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123 lines
4.0 KiB
C++
123 lines
4.0 KiB
C++
/*
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Copyright (c) 2007-2009 FastMQ Inc.
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_DISPATCHER_HPP_INCLUDED__
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#define __ZMQ_DISPATCHER_HPP_INCLUDED__
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#include <vector>
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#include <map>
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#include <string>
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#include "i_signaler.hpp"
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#include "ypipe.hpp"
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#include "command.hpp"
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#include "config.hpp"
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#include "mutex.hpp"
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#include "stdint.hpp"
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namespace zmq
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{
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// Dispatcher implements bidirectional thread-safe passing of commands
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// between N threads. It consists of a ypipes to pass commands and
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// signalers to wake up the receiver thread when new commands are
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// available. Note that dispatcher is inefficient for passing messages
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// within a thread (sender thread = receiver thread). The optimisation is
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// not part of the class and should be implemented by individual threads
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// (presumably by calling the command handling function directly).
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class dispatcher_t
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{
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public:
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// Create the dispatcher object. Matrix of pipes to communicate between
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// each socket and each I/O thread is created along with appropriate
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// signalers.
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dispatcher_t (int app_threads_, int io_threads_);
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// To be called to terminate the whole infrastructure (zmq_term).
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~dispatcher_t ();
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// Create a socket.
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struct i_api *create_socket (int type_);
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// Returns number of thread slots in the dispatcher. To be used by
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// individual threads to find out how many distinct signals can be
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// received.
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int thread_slot_count ();
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// Send command from the source to the destination.
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inline void write (int source_, int destination_,
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const command_t &command_)
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{
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command_pipe_t &pipe =
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command_pipes [source_ * signalers.size () + destination_];
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pipe.write (command_);
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if (!pipe.flush ())
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signalers [destination_]->signal (source_);
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}
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// Receive command from the source. Returns false if there is no
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// command available.
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inline bool read (int source_, int destination_, command_t *command_)
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{
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return command_pipes [source_ * signalers.size () +
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destination_].read (command_);
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}
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// Returns the I/O thread that is the least busy at the moment.
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// Taskset specifies which I/O threads are eligible (0 = all).
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class io_thread_t *choose_io_thread (uint64_t taskset_);
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private:
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// Returns the app thread associated with the current thread.
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// NULL if we are out of app thread slots.
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class app_thread_t *choose_app_thread ();
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// Application threads.
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typedef std::vector <class app_thread_t*> app_threads_t;
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app_threads_t app_threads;
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// I/O threads.
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typedef std::vector <class io_thread_t*> io_threads_t;
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io_threads_t io_threads;
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// Signalers for both application and I/O threads.
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std::vector <i_signaler*> signalers;
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// Pipe to hold the commands.
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typedef ypipe_t <command_t, true,
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command_pipe_granularity> command_pipe_t;
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// NxN matrix of command pipes.
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command_pipe_t *command_pipes;
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// Synchronisation of accesses to shared thread data.
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mutex_t threads_sync;
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dispatcher_t (const dispatcher_t&);
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void operator = (const dispatcher_t&);
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};
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}
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#endif
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